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linux: make patch invocation idempotent

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This commit is contained in:
Vladislav Yarmak 2019-09-27 23:57:55 +03:00
parent a82e6112c9
commit 5c2471afb1
1 changed files with 17 additions and 10 deletions
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27
patch.sh
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@ -28,14 +28,14 @@ DESCRIPTION
opmode="patch" opmode="patch"
while getopts 'rshc:l' flag; do while getopts 'rshc:l' flag; do
case "${flag}" in case "${flag}" in
r) opmode="${opmode}rollback" ;; r) opmode="${opmode}rollback" ;;
s) silent_flag='true' ;; s) silent_flag='true' ;;
h) opmode="${opmode}help" ;; h) opmode="${opmode}help" ;;
c) opmode="${opmode}checkversion" ; checked_version="$OPTARG" ;; c) opmode="${opmode}checkversion" ; checked_version="$OPTARG" ;;
l) opmode="${opmode}listversions" ;; l) opmode="${opmode}listversions" ;;
*) echo "Incorrect option specified in command line" ; exit 2 ;; *) echo "Incorrect option specified in command line" ; exit 2 ;;
esac esac
done done
if [[ $silent_flag ]]; then if [[ $silent_flag ]]; then
@ -181,8 +181,15 @@ rollback () {
patch () { patch () {
patch_common patch_common
if [[ ! -f "$backup_path/$object.$driver_version" ]]; then if [[ -f "$backup_path/$object.$driver_version" ]]; then
echo "Attention! Backup not found. Copy current $object to backup." bkp_hash="$(sha1sum "$backup_path/$object.$driver_version" | cut -f1 -d\ )"
drv_hash="$(sha1sum "$driver_dir/$object.$driver_version" | cut -f1 -d\ )"
if [[ "$bkp_hash" != "$drv_hash" ]] ; then
echo "Backup exists and driver file differ from backup. Skipping patch."
return 0
fi
else
echo "Attention! Backup not found. Copying current $object to backup."
mkdir -p "$backup_path" mkdir -p "$backup_path"
cp -p "$driver_dir/$object.$driver_version" \ cp -p "$driver_dir/$object.$driver_version" \
"$backup_path/$object.$driver_version" "$backup_path/$object.$driver_version"